[PATCH V2 7/9] PCI: tegra194: Disable direct speed change for EP

Vidya Sagar
2022-09-26T13:29:00Z

Disable direct speed change for endpoint to prevent it from doing
speed change by itself post physical layer link up at gen1 and also
to leave link speed in control of the host.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
V2:
* None

drivers/pci/controller/dwc/pcie-tegra194.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 702c55deb747..3e4868ab8416 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1872,6 +1872,10 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)

reset_control_deassert(pcie->core_rst);

+ val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
+ val &= ~PORT_LOGIC_SPEED_CHANGE;
+ dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
+
if (pcie->update_fc_fixup) {
val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF);
val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT;
--
2.17.1